<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>两列式布局</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .container {
            display: flex;


        }
        .aside, .main{
            height: 500px;
        }
        .aside {
            width: 300px;
            background-color: green;
            float: left;
        }
        .main {
            /* flex: 1; */
            background-color: red;
            /* width: calc( 100% - 300px);
            float: left; */
            /* margin-left: 300px; */
            overflow: hidden;/* BFC */
            
        }
    </style>
</head>
<body>
    <!--自适应的两列式布局 
        设计一套布局，两列式布局
            左右    侧边栏固定宽度， 主栏宽度自适应 -->
    <div class="container">
        <div class="aside"></div>
        <div class="main"></div>
        
    </div>
</body>
</html>